Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 10 3 2010 10.5194/acp-10-1057-2010 http://www.atmos-chem-phys.net/10/1057/2010/ http://www.atmos-chem-phys.net/10/1057/2010/acp-10-1057-2010.html http://www.atmos-chem-phys.net/10/1057/2010/acp-10-1057-2010.pdf 1057 1069 2010-02-01 Cloud processing of mineral dust: direct comparison of cloud residual and clear sky particles during AMMA aircraft campaign in summer 2006 A. Matsuki matsuki@staff.kanazawa-u.ac.jp A. Schwarzenboeck H. Venzac P. Laj S. Crumeyrolle L. Gomes Laboratoire de Météorologie Physique, Université Blaise Pascal, Clermont-Ferrand, France Centre National de Recherches Météorologiques, Météo-France, Toulouse, France Frontier Science Organization, Kanazawa University, Japan In order to gain insights into the characteristics of the mineral dust particles incorporated in the actual cloud droplets and the related cloud processing, the French ATR-42 research aircraft equipped both with a counterflow virtual impactor (CVI) and community aerosol inlet was deployed in Niamey, Niger (13&deg;30' N, 02&deg;05' E) in August 2006 within the framework of the African Monsoon Multidisciplinary Analysis (AMMA) project. <br><br> Cloud residual and clear-sky particles were collected separately and analyzed individually using a transmission electron microscope (TEM) and a scanning electron microscope coupled with an energy dispersive X-ray spectroscopy (SEM-EDX). The analysis revealed interesting characteristics on the coarse dust particles (<i>Dp</i>>1&mu;m), particularly those which likely had acted as CCN. <br><br> Traces of heterogeneously formed secondary sulfate, chloride and nitrate were found on many dust particles (though fraction of sulfate may be present in the form of gypsum as primary dust component). These secondary species were particularly enhanced in clouds (i.e. cloud processing). The study illustrates that calcium-rich particles assumed to be carbonates (Calcite, Dolomite) contained the secondary species in significantly larger frequency and amount than the silicates (Quartz, Feldspar, Mica, Clay), suggesting that they represent the most reactive fraction of the mineral dust. 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